Introducing the Next Evolution in SIP Construction: SIPit‑FR + Breathable Cork Render

At SIPit, we’ve always believed that smarter construction comes from combining the right materials in the right way. Over the past few months, we’ve been working closely with our partners at Eco Cork Solutions to develop a breakthrough external wall solution for commercial buildings, modular manufacturers and the holiday‑lodge sector.

Today, we’re excited to share the results: A 1‑hour fire‑rated SIPit‑FR panel finished with a breathable, fire‑resistant cork render applied directly to the external face of the SIP.

This isn’t just an incremental improvement — it’s a fundamental shift in how SIP fire walls can be built.

Why This Matters: A Simpler, Faster, Fully Compliant Wall System

Traditional SIP fire‑rated walls often require multiple layers to meet both fire and moisture‑management requirements:

• Framing out

• Ventilated cavities

• Cavity barriers

• Secondary sheathing

• Additional fire‑stopping components

• Multiple trades and return visits

Each layer adds cost, time, sequencing complexity and — critically — lost internal floor space.

By integrating the SIPit‑FR panel with a breathable cork render, we eliminate that entire build‑up:-

• NO framing out

• NO air cavity

• NO cavity barriers

• NO multi‑layer external build‑up

  
  

The cork render can be applied directly onto the fire‑rated SIPit‑FR panel, creating a clean, compliant and rapid‑install external wall.

Fire Performance You Can Trust

The SIPit‑FR panel provides a certified 60‑minute fire resistance, making it suitable for:

• Commercial units

• Modular buildings

• Holiday lodges and park homes

• Inter‑module fire walls

• Boundary‑adjacent structures

• Schools

  
  

The cork render used in this system is fire‑resistant and vapour‑open, meaning it maintains the breathability required for timber‑based construction while still delivering a robust, weather‑resistant finish.

This combination ensures the wall system meets both fire integrity and moisture‑management requirements without additional layers.

Technical Advantages

1. Faster Installation

With no secondary structure or cavity components, the external wall can be completed in a single, streamlined process. This reduces labour time, simplifies sequencing and accelerates factory or on‑site production.

2. Increased Internal Floor Area

Removing the cavity and framing reduces the overall wall thickness. For modular and lodge manufacturers, this translates directly into more usable internal space — a commercial advantage in every unit.

3. Carbon‑Negative External Shell

Eco Cork Solutions’ render is a carbon‑negative material, locking in more carbon than it emits during production. Combined with the efficiency of SIP construction, this creates a genuinely low‑impact building envelope.

4. Reduced Fire‑Stopping Complexity

No cavity means no cavity barriers. This removes a major point of failure, reduces cost and simplifies compliance.

5. Cleaner, More Predictable Manufacturing

A single integrated system reduces variability, improves repeatability and supports high‑volume modular production.

A Smarter Way Forward for Modern Construction

The combination of the SIPit‑FR panel and Eco Cork Solutions’ breathable cork render represents a new direction for fire‑rated SIP construction — one that prioritises:

• Performance

• Speed

• Simplicity

• Sustainability

• Commercial value

For developers, manufacturers and lodge builders looking to streamline production while meeting stringent fire and environmental standards, this system offers a compelling new option.

If you’d like technical data, samples or a project consultation, our team is ready to help.